Your Flame Shock damage over time has a chance to reset the cooldown of your Lava Burst spell and cause your next Lava Burst spell to be instant.

Lava Surge is a passive shaman ability learned at level 50 for those with the Elemental specialization. It grants [Flame Shock] periodic damage ticks a chance to reset the cooldown of [Lava Burst] and cause the next Lava Burst to be instant.